EP3024634B1 - Ultrasonic sealing device - Google Patents

Ultrasonic sealing device Download PDF

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Publication number
EP3024634B1
EP3024634B1 EP14777157.0A EP14777157A EP3024634B1 EP 3024634 B1 EP3024634 B1 EP 3024634B1 EP 14777157 A EP14777157 A EP 14777157A EP 3024634 B1 EP3024634 B1 EP 3024634B1
Authority
EP
European Patent Office
Prior art keywords
groove
protruding element
peripheral surface
sealing device
sonotrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14777157.0A
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German (de)
English (en)
French (fr)
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EP3024634A1 (en
Inventor
Cristian BETTI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IMA Industria Macchine Automatiche SpA
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IMA Industria Macchine Automatiche SpA
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Publication of EP3024634A1 publication Critical patent/EP3024634A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81419—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex

Definitions

  • This invention relates to an ultrasonic sealing device used in particular for sealing material sheets or strips.
  • An ultrasonic sealing device comprises:
  • the heat sonotrode transmits energy by contact to the material to be sealed, which, by melting, is sealed.
  • sealing devices there are two prior art types of sealing devices: the so-called “heat-sinking” devices, in which the sonotrode is movable in an alternating fashion along a single direction towards, and away from, the material to be sealed, and the anvil is stationary, or rotary; and the rotary sealing devices in which both the sonotrode and the anvil rotate, generally continuously about mutually parallel axes of rotation.
  • the material to be sealed is generally moved intermittently, that is, it is positioned stationary between anvil and sonotrode during the sealing, and away from anvil and sonotrode once the sealing has been completed.
  • the productivity of these sealing devices is generally limited.
  • the material to be sealed can also be moved continuously, thus increasing the productivity, but the high level of friction between the material and the sonotrode and the anvil has an adverse affect on the quality of the sealing, creating creases on the material and dissipating considerable quantities of energy.
  • a rotary ultrasonic sealing device for sealing a sheet of material (woven or non-woven type).
  • the device comprises a sonotrode comprising a working body rotating about an axis of rotation and a presser wheel.
  • the corresponding peripheral edges of the working body and of the presser wheel are configured to allow the transformation of the axial vibration along the axis of rotation in a radial vibration for sealing with respect to the axis of rotation.
  • GB 2 081 805 it is disclosed an apparatus for forming holes in a tape.
  • the apparatus comprises a sonotrode having a wheel with a plurality of pointed projections. These pointed projections penetrate through the tape and they separate the thermoplastic fibers of the tape itself, forming the holes.
  • JP H02 277620 it is disclosed a rotary deforming device for corrugated cardboard sheet.
  • This device comprises an ultrasonic device horn and a rule processing tool.
  • the rotary sealing devices overcome the problems of friction of the heat-sinking sealers, but they have further drawbacks of an energy nature, because only a minimum part of the energy supplied to the sonotrode is actually used for sealing.
  • the sonotrode vibrates axially along the respective axis of rotation and radially along radial directions perpendicular to the axis of rotation.
  • the aim of this invention is to provide an ultrasonic sealing device used, in particular, for sealing material in the form of strips, which overcomes the above mentioned drawbacks of the prior art.
  • the aim of this invention is to provide a high energy efficiency ultrasonic sealing device, with reduced operating costs and able to make high quality seals, advantageously on materials in sheets or strips.
  • the ultrasonic sealing device for advantageously sealing material in strips, comprises a generator of electrical power signals; a converter for converting the electrical power into mechanical vibrations; a sonotrode rotating about a first axis and having a first peripheral surface; and a anvil rotating about a second axis parallel to the first axis and having a second peripheral surface.
  • one between the first peripheral surface and the second peripheral surface has a groove.
  • the groove is circular. More advantageously, the groove is continuous. Alternatively, the groove is discontinuous.
  • the other between the first peripheral surface and the second peripheral surface has a protruding element.
  • the protruding element is continuous; alternatively, the protruding element is discontinuous or, in other words, it is made up of at least two consecutive curved components.
  • a discontinuous protruding element is designed to couple both with a continuous groove and a discontinuous groove having corresponding discontinuities.
  • the protruding element is configured to operate in conjunction with the groove at least axially, that is, at least along directions parallel to the first axis and second axis, in such a way as to seal the material in strips, moved along a direction transversal to the first and second axes of rotation, and passing between sonotrode and anvil, engaging the groove and the protruding element.
  • the protruding element engages the groove for a predetermined depth.
  • This combined architecture of groove and protruding element makes it possible to use the vibrations generated by the sonotrode along axes parallel to the axis of rotation of the sonotrode for sealing the material: in particular, therefore, the vibrations generated axially along the sonotrode are used, at least partly, to obtain the sealing of the material being fed and interposed between sonotrode and anvil.
  • This feature makes it possible to use to the main part of the vibrations of the sonotrode, that is, the axial vibrations, to perform the sealing.
  • groove - protruding element structure also makes it possible to use the radial vibrations as the secondary sealing effect.
  • the presence of the protruding element inside the groove makes it possible to obtain a precise and stable positioning of the material in the sealing zone combined with a high capacity and speed of sealing of the material in the desired point or zone.
  • FIGS 1 and 2 illustrates an ultrasonic sealing device 100 according to a first preferred embodiment of the invention, for advantageously sealing a strip or sheet of material 1, comprising a generator 9 of electrical power signals , a converter 9a for converting the electrical power signals into mechanical vibrations, a sonotrode 2 and an anvil 4.
  • the device 100 can comprise an amplifier 9b for amplifying the mechanical vibrations coming from the converter 9a.
  • the generator 9 of electrical power signals is connected to the converter 9a, which in turn is connected to the amplifier 9b if present (as in the embodiment illustrated in Figure 1 ), the latter being connected to the sonotrode 2. If the amplifier 9b were not present, the converter 9a would be directly connected to the sonotrode 2.
  • the sonotrode 2 is rotatable about a first axis X2 and has a first outer peripheral surface 3 (emitter).
  • the sonotrode 2 receives from the amplifier 9b mainly axial vibrations FA, that is, vibrations with the direction of vibration parallel to the first axis X2, and, secondarily, radial vibrations FR, that is, vibrations with the direction of vibration transversal to the first axis X2. In other words, therefore, the sonotrode 2 vibrates axially along the first axis X2 with axial vibrations FA and radially perpendicularly to the first axis X2 with radial vibrations FR.
  • the sonotrode 2 comprises a first shaft 10 which defines the first peripheral surface 3. More specifically, the first peripheral surface 3 is identified by at least one portion of outer lateral cylindrical shell extending around the first axis X2.
  • the first shaft 10 has sections on planes transversal to the first axis X2 which are circular in shape, which can have a radius variable along the first axis X2.
  • the anvil 4 rotates about a second axis X4, parallel to the first axis X2, and has a second outer peripheral surface 5.
  • the anvil 4 comprises a second shaft 11 which defines the second peripheral surface 5. More specifically, the second peripheral surface 5 is identified by at least one portion of outer lateral cylindrical shell extending around the second axis X4.
  • the second shaft 11 has sections on planes transversal to the second axis X4 which are circular in shape, which can have a radius variable along the first axis X4.
  • the sonotrode 2 is connected to a drive unit, which rotates the sonotrode 2 about the first axis X2.
  • the anvil 4 is connected to a further drive unit, which rotates the anvil 4 about the second axis X4.
  • the sonotrode 2 and the anvil 4 are connected to a single drive unit 8 (as in the embodiments illustrated in Figures 1 and 3 ) for being mutually rotated in a synchronised fashion.
  • the sonotrode 2 and the anvil 4 have directions of rotation V2 and V4 which are opposite to each other.
  • first outer peripheral surface 3 and the second outer peripheral surface 5 have a zone of minimum tangential distance from one another which defines a sealing operating zone.
  • the sonotrode 2 comprises a circular groove 6 made on the first peripheral surface 3, whilst the anvil 4 has a protruding element 7 associated with the second peripheral surface 5.
  • the protruding element 7 advantageously has an annular shape.
  • the protruding element 7 is configured to operate in conjunction with the groove 6 at least axially, that is, along directions parallel to the first axis X2 and second axis X4, in such a way as to seal the material 1 in strips, moved along a direction A transversal to the first and second axes of rotation X2 and X4 and passing between sonotrode 2 and anvil 4, engaging the groove and the protruding element 7.
  • groove 6 and the protruding element 7 are configured and sized for a mutual respective penetration (in use) in the zone of minimum tangential distance from one another of the first outer peripheral surface 3 and the second outer peripheral surface 5, creating a dynamic clamping on the material 1 in strips.
  • groove 6 and protruding element 7 defines a sealing operating zone separate from the flat surfaces (facing each other) defined by the first outer peripheral surface 3 and by the second outer peripheral surface 5 and spaced from each other by a value D.
  • the zone of minimum tangential distance from one another of the first 3 and second 5 peripheral surfaces is divided into a first non-operating zone (defined by the flat surfaces of the two peripheral surfaces 3 and 5 spaced by a value D) and a second sealing operating zone (limited) defined by the relative penetration between groove 6 and protruding element 7.
  • the protruding element 7 and the groove 6 have respective geometrical configurations, in cross-section, which are different.
  • the protruding element 7 and the groove 6 have geometrical shapes which do not mate with each other (that is to say, they are not shaped to be coupled to each other).
  • the protruding element 7 has a geometrical configuration, in cross-section, which is able to penetrate into the groove 6 by a depth P which is less than the maximum depth of the groove 6.
  • the material 1 in strips is sealed using the axial vibrations FA which propagate along the first axis X2 (see also Figures 5 to 10 ).
  • the radial vibrations FR might also contribute to sealing the material, acting in conjunction with the axial vibrations FA.
  • the ultrasonic sealing device 100 allows the material 1 in strips to be sealed in a precise and secure fashion thanks to the continuous dynamic clamping effect on the material 1 which allows the formation of a depression on the material 1 in strips passing in the sealing operating zone: this allows a precise control of the sealing in the desired points and zones.
  • the groove 6 has a continuous extension along the first peripheral surface 3.
  • the groove 6 can have a discontinuous extension along the first peripheral surface 3.
  • the groove 6 forms an annular recess around the first peripheral surface 3.
  • the groove 6 extends perpendicularly to the first axis X2.
  • the protruding element 7 has a continuous annular extension around the second peripheral surface 5.
  • the protruding element 7 can have a discontinuous annular extension around the second peripheral surface 5.
  • the annular discontinuous extension of the protruding element 7 can be obtained with curved stretches of equal length or different length, which are angularly spaced by the same or different angular distances.
  • the protruding element 7 extends perpendicularly to the second axis X4. Preferably, the protruding element 7 is inserted onto the second outside peripheral surface 5. In light of this, the protruding element 7 can be easily and quickly replaced due to wear or size changeover.
  • the protruding element 7 can be made in one piece, that is, be integral with the second outer peripheral surface 5.
  • a discontinuous annular extension of the protruding element 7 can be associated with a groove 6 with corresponding discontinuous extension, or a groove 6 with continuous extension.
  • the protruding element 7 engages partly the groove 6 for a predetermined depth P so as to configure the second sealing operating zone of the material 1 in strips.
  • the depth P configures a height of the second sealing operating zone which is different to the distance D between the peripheral surface 3 or 5 where the groove 6 is formed and the peripheral surface 5 or 3 in which the protruding element 7 is formed (the depth P has a value defined by the configurations and the dimensions of the groove 6 and the protruding element 7).
  • This difference between distance of the peripheral surfaces 3 and 5 and the depth P determines a positioning side by side of the surface(s) of the groove 6 and the surface(s) of the protruding element 7 designed to allow the use of the axial vibrations for the sealing.
  • the protruding element 7 and the groove 6 have a relative geometrical and dimensional configuration which allows the sonotrode 2 to vibrate axially and radially, that is, according to directions parallel with and perpendicular to the first axis X2, respectively.
  • Figures 3 and 4 illustrate a second preferred embodiment of the invention, which differs from the first preferred embodiment illustrated in Figures 1 and 2 in that the circular groove 6 is formed on the second peripheral surface 5 (that is, on the anvil 4), whilst the protruding element 7 is associated with the first peripheral surface 3 (that is, with the sonotrode 2).
  • Figures 5 to 10 illustrate further preferred embodiments of the invention, which differ from each other in terms of the shape of the groove 6 and the protruding element 7.
  • the embodiments of Figures 5-10 can advantageously be applied also to the second preferred embodiment of the invention of Figures 3 and 4 , wherein the groove 6 is associated with the anvil 4 and the protruding element 7 is associated with the sonotrode 2.
  • the groove 6 comprises a bottom 6a, a first side wall 6b and a second side wall 6c.
  • the groove has an aperture with a width L.
  • the protruding element 7 comprises an end head 13, a first flank 130a and a second flank 130b.
  • the end head 13 has width S, smaller than the size L of the aperture of the groove 6, to allow the protruding element 7 to engage partly the groove 6 to the depth P.
  • the protruding element 7 acts in conjunction with one or more, or all three, of the bottom 6a, the first side wall 6b and the second side wall 6c of the groove 6 (see Figures 5 to 10 ) to define one or more sealing operating zones of the material 1 in strips.
  • the sealing operating zone can have a different size, such that they satisfy different operating requirements.
  • the groove 6 has a transversal cross-section, or profile, in the shape of a "V" (defined by the side walls 6b and 6c which extend from the bottom 6a defining the vertex of the "V") and the protruding element 7 has transversal cross-section having a side chamfer 12 substantially parallel to the second side wall 6c and a corner 12a, suitably rounded.
  • the side chamfer 12 connects the end head 13 to the second flank 130b.
  • the corner 12a connects the end head 13 to the first flank 130a.
  • the corner 12a forms a sealing operating zone with relatively reduced size.
  • positioning the side chamfer 12 alongside the second side wall 6c, that is, suitably sizing the protruding element 7 in such a way that the chamfer 12 is positioned alongside the second side wall 6c it is possible to make a sealing operating zone which is relatively large in size.
  • the side chamfer 12 can replace, or add to, the corner 12a for sealing the material 1 in strips.
  • the groove 6 has a transversal cross-section, or profile, in the shape of a "V" as in the embodiment of Figure 5 and the protruding element 7 has a transversal cross-section having a corner 12a and a further corner 12b, suitably rounded, forming, in conjunction, respectively, with the first side wall 6b and the second side wall 6c of the groove 6, two distinct sealing operating zones of relatively reduced size.
  • the further corner 12b connects the end head 13 to the second flank 130b. In short, relative to the embodiment of Figure 5 , the further corner 12b replaces the chamfer 12.
  • the groove 6 has a transversal cross-section or profile "V" as in the embodiments of Figures 5 and 6 and the protruding element 7 has a cross-section which is rounded at the operating head 13.
  • the embodiment of Figure 7 can advantageously be used for sealing materials 1 in strips of reduced thickness or less resistant and subject to frequent breaks.
  • the groove 6 has an irregular transversal cross-section or profile and comprises, as well as a bottom 6a, first side wall 6b and second side wall 6c, a further wall 6d which joins the second side wall 6c to the bottom 6a of the groove 6.
  • the further wall 6d is substantially perpendicular to the first axis of rotation X2. It will be understood that, in alternative embodiments not illustrated, the further wall 6d can have different orientations or, in other words, the further wall 6d can form different angles with respect to the second side wall 6c.
  • the protruding element 7 has a transversal cross-section that is substantially as in the embodiment of Figure 5 , with a corner 12a and a side chamfer 12.
  • the edge 12a forms, in conjunction with the first side wall 6b, a first sealing operating zone which is relatively small in size.
  • the side chamfer 12 is substantially parallel to the second side wall 6c, with which it forms a second sealing zone which is relatively large in size. In practice, the second side wall 6c determines the size of the second sealing operating zone.
  • the groove 6 has a transversal cross-section or profile in the shape of a "U", with a flat bottom 6a and a first side wall 6b substantially parallel to a second side wall 6c.
  • the protruding element 7 has a transversal cross-section which is rounded at the operating head 13, substantially as in the embodiment of Figure 7 .
  • the embodiment of Figure 9 can advantageously be used for sealing materials 1 in strips of reduced thickness or less resistant and subject to frequent breaks.
  • the groove 6 has a transversal cross-section, or profile, in the shape of a "V" as in the embodiments of Figure 5-7 and the protruding element 7 has a corner 12a and a further corner 12b, suitably rounded, forming, in conjunction, respectively, with the first side wall 6b and the second side wall 6c of the groove 6, two distinct sealing operating zones of relatively reduced size.
  • the protruding element 7 also has, at the operating head 13, a central groove 13a, which forms with the groove 6 a large working space for the material 1 in strips.
  • Figures 5-10 can advantageously be applied to both the first preferred embodiment of Figures 1 and 2 , and to the second preferred embodiment of Figures 3 and 4 .
  • the profiles of the groove and protruding element with respect to those illustrated in Figures 5-10 .
  • the side chamfer 12 can be made on a protruding element 7 with a transversal cross-section which is rounded at the operating head 13 (of the type shown in Figure 7 and 9 ).
  • the groove 6 can have a transversal cross-section, or profile, which is curved or substantially semi-circular and can advantageously be coupled to any one of the protruding elements described above.
  • a groove with a semicircular transversal cross-section, or profile can be advantageously coupled to a protruding element with a corresponding rounded or semicircular transversal cross-section, of the type shown in Figures 7 and 9 , thus using fully the axial vibrations FA and the radial vibrations FR and obtaining a maximum use of the power supplied to the sonotrode.
  • This invention provides a method for sealing a strip of material 1 (thermoplastic) using the sealing device described above.
  • the method comprises the following steps:
  • the portion of strip 1 to be sealed engages with at least a side surface of the groove 6 and interposes on a section or surface of the protruding element.
  • the portion of strip 1 to be sealed engages with at least two surfaces (also adjacent) forming the groove 6 and interposes on two distinct sections or portions forming the protruding element 7.
  • the portion of strip 1 to be sealed engages two surfaces and a bottom forming the groove 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP14777157.0A 2013-07-23 2014-07-11 Ultrasonic sealing device Active EP3024634B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000393A ITBO20130393A1 (it) 2013-07-23 2013-07-23 Dispositivo di saldatura ad ultrasuoni
PCT/IB2014/063029 WO2015011597A1 (en) 2013-07-23 2014-07-11 Ultrasonic sealing device.

Publications (2)

Publication Number Publication Date
EP3024634A1 EP3024634A1 (en) 2016-06-01
EP3024634B1 true EP3024634B1 (en) 2019-03-06

Family

ID=49226271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14777157.0A Active EP3024634B1 (en) 2013-07-23 2014-07-11 Ultrasonic sealing device

Country Status (7)

Country Link
US (1) US9561619B2 (it)
EP (1) EP3024634B1 (it)
JP (1) JP6424222B2 (it)
CN (1) CN105408090B (it)
ES (1) ES2729228T3 (it)
IT (1) ITBO20130393A1 (it)
WO (1) WO2015011597A1 (it)

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IN2015KO00684A (it) * 2015-06-20 2015-07-10 B & A Packaging India Ltd
LT3383746T (lt) * 2015-12-02 2019-12-10 Swedish Match North Europe Ab Sandarinimo įtaisas
KR101897631B1 (ko) 2016-08-10 2018-09-12 한국과학기술연구원 단백질 키나아제 저해 활성을 갖는 3,4-다이하이드로피리미도[4,5-d]피리미딘-2(1H)-온 골격의 유레아 화합물
IT201800003324A1 (it) 2018-03-07 2019-09-07 Gima Tt S P A Procedimento per realizzare incarti ermetici e relativa macchina.
KR20200100429A (ko) 2019-02-18 2020-08-26 한국과학기술연구원 단백질 키나아제 저해 활성을 갖는 신규한 피리도[3,4-d]피리미딘-8-온 유도체 및 이를 포함하는 암의 예방, 개선 또는 치료용 약학 조성물
KR102396930B1 (ko) 2020-01-15 2022-05-12 한국과학기술연구원 피리도[3,4-d]피리미딘 유도체 및 이를 포함하는 치료용 약학 조성물
KR102382613B1 (ko) 2020-01-15 2022-04-06 한국과학기술연구원 단백질 키나아제 저해 활성을 갖는 7-아미노-3,4-디히드로피리미도피리미딘-2-온 유도체 및 이를 포함하는 치료용 약학 조성물
CN111605205B (zh) * 2020-05-30 2021-12-03 仙桃市银宏防护用品有限公司 防护服生产用缝口密封机、防护服生产工艺及防护服
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US11407182B1 (en) * 2021-08-11 2022-08-09 Dukane Ias, Llc Depth control of seal line penetration for rotary ultrasonic horn/anvil welding without mechanical stop

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Also Published As

Publication number Publication date
CN105408090A (zh) 2016-03-16
EP3024634A1 (en) 2016-06-01
US9561619B2 (en) 2017-02-07
JP2016525034A (ja) 2016-08-22
ES2729228T3 (es) 2019-10-31
CN105408090B (zh) 2017-11-10
US20160121541A1 (en) 2016-05-05
JP6424222B2 (ja) 2018-11-14
ITBO20130393A1 (it) 2015-01-24
WO2015011597A1 (en) 2015-01-29

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